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Survival analysis of orthodontic mini-implants.
Shin-Jae Lee1, Sug-Joon Ahn, Jae Won Lee
1Department of Orthodontics, School of Dentistry and Dental Research Institute, Seoul National University, Seoul, Korea.
Summary
Orthodontic mini-implant survival is generally sufficient for long treatments, but risk is highest immediately after placement. Increasing patient age is a key factor influencing implant survival rates.
Area of Science:
- Orthodontics
- Biomaterials Science
- Clinical Research
Background:
- Survival analysis is crucial in clinical research for comparing survival distributions and identifying risk factors.
- Orthodontic mini-implants are widely used, necessitating an understanding of their long-term performance and failure predictors.
Purpose of the Study:
- To investigate the survival characteristics of orthodontic mini-implants.
- To identify risk factors associated with orthodontic mini-implant failure using survival analyses.
Main Methods:
- A survival study included 141 orthodontic patients with 260 sandblasted and acid-etched orthodontic mini-implants.
- Kaplan-Meier survival curves and Cox proportional hazard models were employed to analyze implant failure data.
- Nonparametric life table methods visualized the hazard function for implant failure.
Main Results:
- Out of 260 implants, 22 failures were recorded.
- The highest risk of orthodontic mini-implant failure occurred immediately after placement.
- Increasing patient age was identified as a significant factor impacting implant survival.
Conclusions:
- The hazard function's decreasing pattern suggests progressive osseointegration of orthodontic mini-implants.
- Special precautions are advised for younger patients due to a higher failure probability, particularly early post-placement.